Lifting jack



April 14, 1925. 1,533,168

I. E. DEARSLEY' LIF'IING JACK Filed Aug 14 1924 2 Shwhs-Sheet 1 A ril 14, 1925.

\ 1,533,168 I. E. DEARSLEY A LIFTING JACK Filed Aug. 14. 1924 2 shun-sheet 2 rufe on PatentedApr. 14;1925. K i i UNITED STATES PATENT OFFICE IRWIN E. DEARSLEY, OF RACINE, WISCONSIN, ASSIGNOR IO WALKER MANUFACTUR- ING COMPANY, OF RACINE, WISCONSIN, A CORPORATION OF WISCONSIN.

LIETING JACK.

Application filed August 14, 1924. Serial No. 732,041.

To all whom it may concern: 7 The object of the invention includes, be-

Be it knownthat I, IRWIN E. DEARSLEY, sldes Providing a l ollel'htihg as briefly a iti fth U it d St t idi t noted above and as set forth in more detail R i i th county f R i d St t here nafter, providing an anti-friction supof' lVisconsin, have invented certain new Portlhg hearing for the driving and lifting and useful Improvements in Lifting Jacks, f h to r d the lifting Strain to i! of h h th 'f n j i a ifi ti mlnnnum; providing automatic latching and This invention relates to the class of dc- T g means between the ed BWS vices known as lifti j k d more-parand between the screws and the standard, to

ti l l t h a d i d i d t h positively enforce the successive movement an exceptionally long lift in proportion t 0f the screws when the driving means is 1'0- i i and h i ht h i lowered L tated continuously in either dlrection; and

lapsed position. providing a. compact and sightly jack, in yvhil th uses f h a j k are m which the parts are easily assembled and 5 merable, it is especially adapted for advanth y accesslblegeous use in the automotive industrywvith fi bj fi a flntages of the inthe new oversize or balloon tires. For this U W111 e readily apparent from the use it is desirable to have a jack which is followmg detalled, descnptloh of one pcompact and of small vertical height when Proved form of the app lowered, in order to be placed under the h p y g drawlngr low axle or other frame part when the; tir Fig. 1 1s a central vertical section through is collapsed, and capable of a comparatively the J h g the Same in Partially long lift to elevate the car above its normal vatefi P driving height in order that the tire may lg- 2 1S a Central veltlca-l Q taken b h d, 7 at right angles to Fig. 1, showing the jack The jack is of that type employing a plu- 1n o d p hrality of screws working one within another f-f- 3 IS & fll sec lon taken suband each contributing its share to the total stanfilallv 0h hhe '73 of F 2 lifi; f th j k A di t thi jnvem Fig. 4 1s a perspective view of the locking tion the screws are telescoped or nested sleeYe :Ulbe r he inner screw. v

within one another and within the standard t-P 5 a P P P P View Showing the of the jack when in lowered position, and lower fhcehf the drlvmfi driving connections are provided whereby T stfltmhary sifahdard h l upon a continuous" rotation of the driving 1 5. shbsiahtlany cyhhdr1c31 hollow 35 means, which may be operated from a dis- Castlhg havlhg broad suppol'hhg base tance, the screws are successively and indi- At Its pp ehd'fhe h d has {111 vidually elevated one at a time. Accordl h pp a 2 and a in to the embodiment of the invention here houslng 0S ng the large drivshown by "way of example, two nested mg herelhilftel' d- A COVer screws are employed, the outer screw being P a dethchahly Connected Vlth the q an exteriorly threaded sleeve which meshes her 4 y Screws completes the tl' within a nut formed in the rotatable drivabout the driving mechanism A central ing gearQ Thei innor screw meshes within a Circular p g i the cover 5 permits nut formed in the upper end of the outer e c evatlon thercthrough of the lifting screw sleeve, Means are provided to hold Screws hereinafter described. 0 the inner screw against rotation at all times The rotatable driving member 7 here but allow it to move vertically. The outer shown as a comparatively large beveled screw sleeve is first held against rotation, gear. is supported above the ring 3 of standand lifted by the driving nut to its full eleard 1 by means of an interposed ball bearation, carrying the inner screwv with it ing assembly 8 or other equivalent form bodily. When the sleeve reaches the upper of anti-friction supporting means. Since limit of its travel, it becomes locked with the driving gear 7 supports the. lifting the driving nut and is allowed to rotate, screws, which in turn support the load, the and then acts as a. unit with the driving nut entire load will always be transmitted 'to to lift theinner screw up through the sleeve. the standard 1 through these anti-friction bearings 8 and in this way the lifting or driving strain'will be reduced to a minimum. Journaled in a housing extension 9 formed at one side of the standard 1, is ashort-shaft 10-,having keyed thereon, a

- small beveled pinion 11 meshing with the driving gear 7.-

, ball bearing, assembly 8 to a convenient position.

The outer end of shaft 10 is provided with a socket member 12, to cooperate with any suitable form of removable handle whereby the jack may be operated from adistance. It will be notedthat the shaft 10 tilts upwardly -so that the operators end of the handle will be elevated The beveled driving gear has a central sleeve 13 extending downwardly through the and the upper end of 3, to act as a guiding and supporting ring and this sleeve 15 strengthening member,

interiorly threaded to act as a nut for lift-' This outer screw is, in the form of a hoilowsleeve 14,-exteriorly threaded to mesh with the-nut 13 in the ing the outer sere\ nel .17 formed in the standard 1 directly sleeve on'by a universally rocking cap 21 may adapt itself to the tilting load as below the lower end of driving nut-13. The nut 13 is formed on its lower face with a locking shoulder 18 with which one of the pins 15 is adapted to cooperate when the 14 has reached the'upperlimit of its travel. I

The inner screw 19, which isthreaded in the same direction as the outer screw 14, meshes with 'a. nut'20. formed in the upper end of the outer screw sleeve 14. This inner screw is ,of substantially the same height as the outer screw and the standard, and carries at its upper end a load supporting cap 21 which is mounted therejoint so that the the jack is elevated. Movably suspended in the annular space 22 between the inner and outer screws, is a comparatively thin me- I tallic sleeve 23. At its lower end this sleeve is provided 24 which travel up and down'in slots 25 formed in the standard" 1,. parallelto "and spaced ninety degrees from the slots 16.previously described. Removable spring actuated locking pins 26, project into the slots 25 nearthe upper end thereof.- a

Tube .23 is provided with oppositely posed vertical slots 27, extending nearly its entire length and in line with the lugs-24. Short pins 28 are slidably'mounted in a diamet ically disposed opening in the lower with outwardly extending lugs end of screw 19, and a compression spring 29 interposed between the inner-ends of the two pins 28 outwardly.

in the slots 27 in tube 23'; It will be noted normally tends to force thenr These pins 28 slide up and down that the tube 23 is locked at all times to the 24,- and that in, turn the inner screw' 19 is locked to. the tube 23 by means of pins 28 operating in' slots 27. By this means,

although the screw 19 may be elevated bodily completely ou't of the standard 1, as shown in Fig. 1,- it is at all'times locked cannot rotate.- This tubularlocking means for the nner screw is not claimed specifically herein,.but is claimed in the copen-d-' ing application of-Gunnar Jensen, Serial No. 732,023 filed of even date herewith.

At the interior of its lower'end,-the outer screwsleeve 14 is provided with ,cammed locking shoulders, 30 with which the spring ,stationarystandard 1 by means of the lugs 'to the stand. rd in such a manner that it i thrust pins 28- are adapted to cooperate to lock the two screws together when the inner screw iscompletelyneste'd withinthe outer 'screw.- The cammed or sloping surfaces leading to the shoulders 30 are so inclined that,the pins 28'will readily ride out away from these shoulders and slide up the'inner surface of sleeve 14; when the parts are reftated in such a direction as to elevatethe screws, but-will ride out and lockagainst shoulders 30 when the parts are so rot-ated as to lower the inner screw completely within the outer screw.

A. plate 31' driven into the lower face of .base plate 2 closes the opening in the base ofthe standard after the parts have been assembled. Although'the screw mem-' bers may be removed through this bottom opening by removing the base plug 31, they portion of the'ja'ek. when the cover 5 is removed.

In operation, 2 the jack, in collapsed or .lowered position as shown 'in Fig. 2, is

inserted beneath the member to be elevated.

The removable handle is then inserted in, 'thesocket 12, and, with theparts threaded as shown in the drawing, is rotatedcontinuously ,iii a clockwisedircction. This will rotate the driving beveled gear 7 in a counter clockwise direction, as viewed "from abo\'e, and since the outer screwsleeve' 1-1 is held from rotation by thev pins .15 pro jectin'g'into'thc grooves 16 in" standard 1,

the rotation ofnut 13 in the driving member-willelevate the screw sleeve 14 which may also be taken out through-the upper carries bodily with 'it the inner screw 19 and the load supported thereby.- \Vhen the sleeve 1 L has reached the upper, limit .ofits travel, the .pins 15 will run out; of slots 16-,into the annular channel 17, allowing them to rotate, and will simultaneously lock against the lower surface of nut '13. The

. driving gear 7 and sleeve 14 willnow rotate 'as a unit. Since the inner screw 19 is i still held against rotation by the tubular member 23 as abovedescribed, the rotating nut 20 in the upper end of sleeve 14 will now elevate the .inner screw 19 and the load carried thereby, as indicated in Fig. 1. The

upward travel of the parts is limited by the engagement-of pins 28 with the upper ends of slots 27 and the engagement of the top of tube 23, against the bottom of nut 20. Before reaching-the upper limit of their travel lugs 24 will pass theyielding locklng pins 26, which then'snap out under the lugs. It willbe noted that the extreme height of the jack when in extended positionis between two and three times its a height when in collapsed position.

When the jack is to be lowered the handle is rotated continuously in the opposite direction; The screw sleeve 14 will still be locked to the lower. surface of drivingmember 7 extended below the lower end of the tube.

hen the inner screw 19reaches the lower limit of its travel within the outer screw, the pins 28 in the lower end of screw 19 :will engage with looking shoulders 30 in ther rotation of this .sleeve.

the lower end of sleeve 14 and prevent fur- By holding tube 23 elevated until this time, so that pins 28' arev at the lower ends of slots 27, adjacent the lugs 24 on the tube, the twisting strain on tube 23 when sleeve 14 is locked,

is taken by the stronger lower end of the tube,'and the possibilityof twisting the tube is avoided. The sleeve 14 will now be screwed down through the .continuously rotating driving member 7, the pins 15 on the sleeve sliding down through the slots 16 in the standard. Also lugs 24 will be pushed downpast spring pins 26 and the tube 23 will slide down to its lowered position.

reduction, due .to the reducing beveled presents a very sightly appearance, there Itwill be noted that the load supporting j parts of this jack are comparatively simple, and may be made strong and rugged to support a considerable load. The great gear gears, ,l1 and 7 and the screws which operate singly, enable one to elevate a great load with little eiiort, this being further reduced by the anti-friction supporting bearings for the lifting and driving members. .The jack, when lowered, is compact and may be stored in a small space, and

being no projecting parts except the cap 21 and the socket member 12.

Obviously other forms of rotary driving means than the beveled gears here shown standard, a

may be used, and the proportions and dctails .of the several parts may be varied without departing from the scope of the invention as set forth in the followingclaims.

I claim: A

1. A lifting'fjackcomprising a hollow rotatable driving member, mounted in the upper portion of the standard, a pair of nested screws mounted in the standard and driving member, and separate connections between the standard and each screw, whereby when the driving member is continuously rotated the screws will be individually and successively elevated.

2. A lifting jack comprising a hollow standard, a rotatable driving member mounted in the upper portion of the stand-. ard, a pair of nested screws mounted in the standard and driving member, and separate connections between the standard and each screw, whereby when the driving member is continuously rotated the outer screw .will first be positively elevated to its full height, carrying the inner screw bodily with it, and then the inner screw will be elevated with relation to the outer screw.

3. A lifting jack comprising a hollow standard, a rotatable driving member mounted in the upper portion of the standard, a pair of nested screws mounted in the standard and driving member, and separate connections between the standard and each screw, wherebyi'when the driving'member is continuously rotated the outer screw will first be positively elevated to its full height, carrying the inner screw'bodily with it, and then the inner screw will beelevated with relation to the outer screw, and connections between the two screws whereby upon reverse rotation of the driving means the inner screw will first be completely nested in the outer screw, and then both screws' [will be positively lowered into the standard.

4. Alifting jack comprising a standard, a rotatable interiorly threaded driving member mounted in the standard, an exteriorly threaded sleeve meshing within the driving member and having an interiorly threaded nut formed in its upper end, a screw meshing in the nut, means cooperating with the lower end of the screw to prcvent its rotation but allow .the screw to move vertically, and means for positively preventing rotation of the sleeveirrcspective of the load thereon. until it reaches the upper limit of its travel'and then locking the sleeve to the driving member to turn therewith.

5. A lifting jack comprising a standard, a rotatable, interiorly threaded driving member mounted in the standard, an exteriorly threaded sleeve meshing within the screw meshing in the Hula means torining a slid ng connection between the standard -and the lower end of thescrew to prevent rotation of the screw but allow it to move longitudinally; and means positively prevent-' ing rotation of the sleeve irrespective of the =load thereon until it reaches the upper limit of its travel and then lockingthe sleeve to the 'driving'memberto turn therewith.

'6. A lifting jack comprising a standard, a rotatable interiorly threaded driving member mounted in thestandard, an-exteriorly: threaded sleeve meshing within the driving member and having an interiorly threaded nut formed in its upper end, a

'. screwgmeshing in the nut, means cooperating with the there being a vertical in- --ing with an annular-channel directly below the driving member, and a projection on the lower portion of the sleeve which slides in the groove during the vertical travel of the lower end of the screw to prevent its rotation but allow the screw to' move vertically, 1,05 terior groove in the standard communicat-.

driving memberand having an interiorly threaded nut formed in its upper end, a screw meshing in the nut, means cooperating with the lower end of the screw to prevent its rotation but allow the screw to imov'e vertically, means-for preventing rotation of the sleeve until it reaches the upper limit 7 of its travel and then looking the sleeve to the driving memher to turn therewith, and a yieldable locking member on the lower portion of the screwcooperating with a shoulder in the lower end of the sleeve when these members are 'telescoped and the driving member is being rotated to lower the jack.

IRWIN nnEARs EY. 

